Presented Without Proof(an exercise for the reader)

I was reading an article on California’s Proposition 65 in a journal called “Environment.” I’m now wondering whether I dare cite an article that appears alongside the following ad:

(The citation is William S. Pease (1991). “Chemical Hazards and the Public’s Right to Know: How effective is California’s Proposition 65?” Environment 33 (10), pp. 12-20.)